JN0-351 Exam Information and Outline
Enterprise Routing and Switching, Specialist (JNCIS-ENT)
JN0-351 Exam Syllabus & Study Guide
Before you start practicing with our exam simulator, it is essential to understand the official JN0-351 exam objectives. This course outline serves as your roadmap, breaking down exactly which technical domains and skills will be tested. By reviewing the syllabus, you can identify your strengths and focus your study time on the areas where you need the most improvement.
The information below reflects the latest 2026 course contents as defined by Juniper. We provide this detailed breakdown to help you align your preparation with the actual exam format, ensuring there are no surprises on test day. Use this outline as a checklist to track your progress as you move through our practice question banks.
Below are complete topics detail with latest syllabus and course outline, that will help you good knowledge about exam objectives and topics that you have to prepare. These contents are covered in questions and answers pool of exam.
Layer 2 Switching or VLANs
- Identify the concepts, operations, or functionalities of Layer 2 switching for the Junos OS:
- Bridging components
- Frame processing
- Describe the concepts, benefits, or functionalities of VLANs:
- Ports
- Tagging
- Native VLANs and voice VLANs
- Inter-VLAN routing
- Demonstrate knowledge how to configure, monitor, or troubleshoot Layer 2 switching or VLANs:
- Interfaces and ports
- VLANs
- Inter-VLAN routing
Spanning Tree
- Describe the concepts, benefits, operations, or functionalities of the Spanning Tree Protocol (STP):
- STP and Rapid Spanning Tree Protocol (RSTP) concepts
- Port roles and states
- Bridge Protocol Data Units (BPDUs)
- Convergence and reconvergence
- Demonstrate knowledge how to configure, monitor, or troubleshoot Spanning Tree:
- STP
- RSTP
Layer 2 Security
- Identify the concepts, benefits, or operations of various Layer 2 protection or security features:
- BPDU, loop or root protection
- Port security, including MAC limiting, DHCP snooping, Dynamic ARP inspection (DAI) or IP source guard
- MACsec
- Storm control
- Identify the concepts, benefits, or operations of Layer 2 firewall filters:
- Filter types
- Processing order
- Match criteria and actions
- Demonstrate knowledge how to configure, monitor, or troubleshoot Layer 2 security:
- Protection
- Port security
- Storm control
- Firewall filter configuration and application
Protocol Independent Routing
- Identify the concepts, operations, or functionalities of various protocol-independent routing components:
- Static, aggregate, and generated routes
- Martian addresses
- Routing instances, including routing information base (RIB) groups
- Load balancing
- Filter-based forwarding
- Demonstrate knowledge how to configure, monitor, or troubleshoot various protocol-independent routing components:
- Static, aggregate, and generated routes
- Load balancing
- Filter-based forwarding
OSPF
- Describe the concepts, operations, or functionalities of OSPF:
- Link-state database
- OSPF packet types
- Router ID
- Adjacencies and neighbors
- Designated router (DR) and backup designated router (BDR)
- OSPF area and router types
- Realms
- Link-state advertisement (LSA) packet types
- Demonstrate knowledge how to configure, monitor, or troubleshoot OSPF:
- Areas, interfaces, and neighbors
- Additional basic options
- Routing policy application
- Troubleshooting tools (ping, traceroute, traceoptions, show commands, logging)
IS-IS
- Describe the concepts, operations, or functionalities of IS-IS:
- Link-state database
- IS-IS Protocol Data Units (PDUs)
- Type, length, and values (TLVs)
- Adjacencies and neighbors
- Levels and areas
- Designated intermediate system (DIS)
- Metrics
- Demonstrate knowledge of how to configure, monitor, or troubleshoot IS-IS:
- Levels, interfaces, and adjacencies
- Additional basic options
- Routing policy application
- Troubleshooting tools (ping, traceroute, traceoptions, show commands, logging)
BGP
- Describe the concepts, operations, or functionalities of BGP:
- BGP basic operation
- BGP message types
- Attributes
- Route/path selection process
- Internal and external BGP (IBGP and EBGP) functionality and interaction
- Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP:
- Groups and peers
- Additional basic options
- Routing policy application
- Troubleshooting tools (ping, traceroute, traceoptions, show commands, logging)
Tunnels
- Identify the concepts, requirements, or functionalities of IP tunneling:
- Tunneling applications and considerations
- Generic Routing Encapsulation (GRE)
- IP-IP
- Demonstrate knowledge of how to configure, monitor, or troubleshoot IP tunnels:
- GRE
- IP-IP
- Troubleshooting tools (ping, traceroute, traceoptions, show commands, logging)
High Availability
- Identify the concepts, benefits, applications, or requirements for high availability in a Junos OS environment:
- Link aggregation groups (LAG)
- Redundant trunk groups (RTG)
- Virtual chassis
- Graceful restart
- Graceful Routing Engine switchover (GRES)
- Nonstop active routing (NSR)
- Nonstop bridging (NSB)
- Bidirectional Forwarding Detection (BFD)
- Virtual Router Redundancy Protocol (VRRP)
- Unified In-Service Software Upgrade (ISSU)
- Demonstrate knowledge of how to configure, monitor, or troubleshoot high availability components:
- LAG and RTG
- Virtual chassis
- Graceful restart, GRES, NSB, and NSR
- VRRP
- ISSU
- Troubleshooting tools (traceoptions, show commands, logging)